BERKELEY, Calif. (AP)  Three cardboard cutouts of black men were found hanging by nooses on the Berkeley campus of the University of California.

School spokeswoman Amy Hamaoui said police are trying to determine who hanged the effigies that were found at two prominent campus locations Saturday morning. The spokeswoman said the effigies appear to be connected to a noon-time demonstration nearby planned to coincide with a national protest against police brutality dubbed “#blacklivesmatters.” The effigies appear to be life-size photos of lynching victims.

The effigies had names of lynching victims and the dates of their death. At least one effigy had “I Can’t Breathe” printed on the front. Hamaoui said it’s unclear whether protest organizers or someone else hanged the effigies. Two were removed by police and a student took down the third.